JP3019123U - Indoor stopcock with backflow prevention for cold regions - Google Patents

Abstract

(57) [Summary] [Purpose] This is a piping system equipped with an indoor water stop valve with backflow prevention in cold regions to simplify draining work. [Structure] A movable piece 30 by a spring 26 is connected by an elastic ring 31 below a spindle 26 which connects or closes a passage 23 between an inlet 21 and an outlet 22.
An annular packing 27, which is in constant contact with the cylinder surface 28, is mounted below the threaded portion of the spindle 26 that is screwed with the valve box 20,
Below the passage, there is provided a release rod 34 having an elastic ring 36 that pushes up the top 30 when backflow is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an indoor stopcock with backflow prevention for cold regions used for indoor water pipes.

[0002]

[Prior art]

 In cold regions, during winter, the water in indoor pipes often freezes, rendering the water supply unusable, even indoors. For this reason, a drain plug that drains water from the pipe and discharges it into the ground below the freezing depth is used when going to bed or going out for a long time.

FIG. 5 is a water supply pipe diagram of a general house. Reference numeral 1 is a water pipe, 2 is a water tap, 3 is a drain valve of the water tap 2, 4 is a start-up re-pipe that communicates with the water pipe 1 and introduces the water of the tap water into the room, and after the start-up re-pipe 4 is horizontal. It becomes a pipe, and a faucet 5 is provided at the end, an indoor water stop 6 with backflow prevention is provided in the middle of the horizontal pipe, and faucets 7 and 8 are provided before and after it.

Here, when the faucet 5 is opened and water is supplied to the washing machine 9 via the hose 10, if negative pressure is generated in the underground water pipe 1 for some reason, the washing water in the washing machine 9 Is attached to the water pipe 1 to prevent it from flowing back into the water pipe 1 and becoming dirty with dirty water.

FIG. 6 is a sectional view of the indoor water stopcock 6 with backflow prevention shown in FIG. In the figure, 11 is a valve box, 12 is an inflow port, 13 is an outflow port, 14 is a passage that connects the inflow port 12 and the outflow port 13, and above the passage 14, there is a spindle 16 having a handle 15 attached, and a spindle 16 The screw threaded on the outer periphery of the screw meshes with the screw formed on the inner wall of the valve box 11, and the spindle 16 moves up and down by the rotation of the handle 15. Reference numeral 18 denotes a top, which is composed of a large diameter portion and a small diameter portion, the packing 17 is accommodated in the large diameter portion, and the small diameter portion is fitted in a vertical hole of the spindle 16. A spring 19 is mounted between the top 18 and the spindle 16 and has a force smaller than the water pressure flowing from the passage 14 to press the top 18 in the direction of closing the passage 14.

In the illustrated water-flowing state, the water from the inflow port reaches the passage 14, and the top 18 that has blocked the passage 14 is pushed up by water pressure to be supplied to the outflow port. When the handle 16 is operated to move the spindle 16 downward, the top 18 is also interlocked and finally, the packing 17 accommodated in the top 18 blocks the passage 14 and the water is stopped. In addition, when negative pressure is generated in the underground water pipe for some reason while the water is flowing, the comma 18 immediately descends due to the action of the spring 19, the packing 17 blocks the passage 14, and the piping after the passage 14 is closed. The water does not flow back, which is a so-called backflow prevention state.

In order to drain water from the pipe in the winter, first, the backstop prevention indoor stopcock 6 and the faucets 5 and 7 are opened to operate the drainage stopper. The same thing happens with the indoor water stopcock 6 with backflow prevention. Therefore, after the indoor water stop valve 6 with backflow prevention, water in the section reaching the faucet 5 remains and freezes. Therefore, the faucet 8 is opened to remove residual water.

[0008]

[Problems to be solved by the device]

 Although the draining work of the pipe has been described above, it is indispensable to open and close the faucets 7 and 8. Especially, the faucet 8 needs a drainage receiver for receiving the residual water. Therefore, there has been a demand for a device that can drain all the water in the pipe from the drain plug without opening and closing the faucets 7 and 8.

In addition, since a small amount of residual water is generated in the vicinity of the top 18 and the passage 14 of the conventional indoor water stop valve with backflow prevention after draining work, the top 18 cannot be pushed up by water pressure when it freezes. It was not possible to pass water from there, and it took time to warm the valve box 11 and perform the deicing work.

Further, if water is drained in a cold season, the handle of the indoor water stop valve with backflow prevention may not be able to be operated. This is because there is a slight gap at the position where the outer peripheral screw of the spindle 16 and the inner screw of the valve box 11 are meshed with each other, so that the invading water freezes and the operation cannot be performed. It was also desired that there be no such phenomenon.

The object of the present invention is to solve the above-mentioned problems in the prior art, to be used in cold regions, easy to operate, and capable of completely draining water regardless of the piping condition. To provide an indoor stopcock with backflow prevention for the ground.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a water inlet and a water outlet in a valve box, and in order to connect or close the passage between them, a handle operation above the passage allows the inside of the valve box to be opened. The annular packing that contacts the cylinder surface moves up and down by a spindle with a top connected to it.When the spindle moves up, the top is pressed by a spring with a force lower than the water pressure flowing from the passage to close the passage. The feature is that the lower part is provided with a release rod that pushes upward the top that is constantly pushed downward by the spring when the passage is closed.

[0013]

[Action]

 When the handle is operated and the spindle moves up, the water is in the water passing position, and the top is pressed by the spring to block the passage, but the water entering from the inlet pushes the top up by the water pressure and passes the passage. Is open and the water is flowing out of the outlet.

When the handle is operated to move the spindle downward, the spindle comes to a water stop position, and the spindle is in a water stop state in which the top is pushed down to close the passage.

If a negative pressure is generated in the underground water pipe for some reason while the water is flowing, or if the drain valve is operated in the winter to drain the water, the water in the pipe is discharged to the ground and the water pressure is As it disappears, the spring pushes down the top and blocks the passage. A so-called backflow prevention state occurs, and the water on the outflow side of the present invention remains trapped in the pipe. To drain the stagnant water in this state, push the release rod at the bottom of the passage of the present invention upward, and the tip will push up the top, so the passage will be conducted and the water in the pipe will be completely discharged from the drain tap. Is discharged to.

[0016]

【Example】

 Hereinafter, the present invention will be described with reference to the illustrated embodiments.

In FIG. 1, a passage 23 is provided in the center of the valve box 20 provided with an inlet 21 and an outlet 22. The inlet 21 is connected to the water drain plug 2 side and the outlet 22 is connected to the pipe on the faucet 5 side. .

Reference numeral 24 denotes a valve seat formed on the upper surface of the passage 23, and above the passage 23 is a spindle 26 to which a handle 25 is attached, and a screw threaded on the outer periphery of the spindle 26 is formed on the inner wall of the valve box 20. The spindle 26 is moved up and down by meshing with the screw and rotating the handle 25.

An annular packing 27 is mounted below the screw of the spindle 26, and the cylinder surface 28 provided under the above screw of the valve box 20 and the annular packing 27 are always in contact with each other. A vertical hole is provided below the spindle 26, and a small-diameter portion of a top 30 accommodating a packing 29 that comes into contact with and separates from the valve seat 24 is inserted. A partially cut elastic ring 31 is mounted near the end of the small-diameter portion. Since the outer diameter of the ring 31 in the normally expanded state is larger than the minimum inner diameter of the spindle 26, the top 30 is prevented from falling off the spindle 26.

Reference numeral 32 denotes a spring, which is provided between the top 30 and the spindle 26 via a spring receiver 33 to constantly press the top 30 downward. However, when water pressure is applied to the top 30, the top 30 is compressed to open the passage. It will be released.

Reference numeral 34 is a release rod provided below the valve box 20 and directly below the passage 23. A retaining ring 35 is mounted on the upper side of the valve box 20, and an annular packing 37 which is always in contact with the cylinder portion 38 of the valve box 20 is provided in the center. The ring 36 made of elastic material is attached to the lower part of the ring 36. The outer diameter of the ring 36 is larger than the inner diameter of the cylinder portion 38, and the outer diameter of the ring 36 when the ring 36 is narrowed. Is smaller than the inner diameter 39 of the end face of the valve box 20.

Next, the operation of this embodiment will be described. First, the water flow state shown in FIG. 1 will be described. At this time, the spindle 26 is at the uppermost position, and in this state, the packing 30 accommodated in the top 30 contacts the valve seat 24 and closes the passage 23 by the action of the spring 32. However, it is pushed up by the pressure of the water flowing in from the inflow port 21, and the passage 23 is in a water-permeable state. Therefore, the water from the inflow port 21 passes through the passage 23 and is supplied to the faucet 5 from the outflow port.

Next, the water stop state will be described with reference to FIG. At this time, the spindle 26 is at the lowermost position, and in this state, the top 30 is pushed down because it comes into contact with the lower end of the spindle 32, and the packing 29 comes into contact with the valve seat 24 and closes the passage 23. Therefore, water is not supplied to the faucet 5.

Next, the operation when draining water will be described with reference to FIG. At this time, the spindle 26 is at the uppermost position and is similar to the water passing state, but since there is no pressure of water flowing from the inflow port 21, the top 30 is pressed against the valve seat 24 by the pressing of the spring 32. 29 abuts. At this time, when the release rod 34 is pushed up, the top 30 is raised and the packing 29 is separated from the valve seat 24. Here, the ring 36 attached to the release rod 34 is once narrowed from the exposed free state, passes through the inner diameter portion 39 of the end face of the valve box 20, and enters the upper bag portion. By this operation, the water on the outflow side flows backward, reaches the drain valve of the water draining tap from the passage 23, and is discharged underground.

Next, after draining water, when water is re-supplied when the residual water portion freezes, water from the inflow port 21 smoothly flows through the passage 23, the valve seat 24 and the packing 29. In addition, the residual water is partially thawed by the water temperature at this time, the release rod 34 is pushed downward by the water pressure, and the ring 36 once narrows and passes through the inner diameter portion 39 of the end face of the valve box 20 to the lowermost position. It Further, in the present embodiment, when a negative pressure is generated in the water pipe for some reason during the passage of water, the pressure at the inflow port 21 becomes a negative pressure of instantaneous zero or less, so that the top 30 is divided into the spring 32 and the top 30 itself. It descends due to its own weight, the packing 29 contacts the valve seat 24, and the passage 23 is closed, as shown in FIG. Therefore, the backflow of water from the faucet 5 is prevented, and the sewage does not backflow. Further, the release rod 34 also tries to be raised by the negative pressure, but it does not rise because the outer diameter of the ring 36 is larger than the inner diameter portion 39 of the end face.

Finally, the spindle 26 and the valve box 20 are meshed with each other by a screw, but since the annular packing 27 is provided below the portion, the spindle 26 is constantly sealed with the cylinder 28 regardless of the vertical movement of the spindle 26. No intrusion and no freezing.

[0027]

[Effect of device]

 As described above, the indoor water stopcock with backflow prevention for cold regions of the present invention is the same as the operation method of the conventional indoor waterstop with backflow prevention, but only by pushing the release rod 34 when draining water. It is not necessary to operate the water drain faucet 8 or the air inflow faucet 7 of the conventional piping. Moreover, the installation of those faucets is unnecessary and it is economical. In addition, the residual water inside the device does not freeze when draining the drain plug and does not obstruct the passage when re-passing water. No work is required, and water can be passed immediately. Furthermore, the steering wheel can be operated smoothly even in cold weather.

[0028]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a backstop prevention indoor water stopcock for cold regions according to an embodiment of the present invention in a water-flowing state.

FIG. 2 is a cross-sectional view of a backstop prevention indoor water stopper according to an embodiment of the present invention in a water-stopped state.

FIG. 3 is a cross-sectional view of an indoor water stopper with backflow prevention for cold regions according to an embodiment of the present invention in a drained state.

FIG. 4 is a cross-sectional view showing a backflow prevention state of an indoor water stop valve with backflow prevention for cold regions according to an embodiment of the present invention.

FIG. 5 is a water supply pipe diagram of a general house.

FIG. 6 is a cross-sectional view of a conventional indoor water stopcock with backflow prevention.

[Explanation of symbols]

 6. Indoor stopcock with backflow prevention 21. Inlet 22. Outlet 23. Route 24. Valve seat 26. Spindle 27. Annular packing 29. Packing 30. Comma 31. Ring 32. Spring 34. Release rod 36. Ring 37. Annular packing

Claims (2)

[Scope of utility model registration request] 1. A valve box has a water inlet and a water outlet, and in order to connect or close a passage between them, an annular packing which is in contact with a cylinder surface inside the valve casing is provided outside by a handle operation above the passage. The spindle with the top connected downward moves up and down, and when the spindle moves up, the top is pressed in the direction of closing the passage by a spring with a force lower than the water pressure flowing in from the passage. An indoor water stopper with backflow prevention for cold regions, which is provided with a release rod that pushes the top pressed downward. 2. The release rod according to claim 1, wherein a retaining ring is attached to an upper portion of an outer side to prevent the release rod from falling out of the valve box, an annular packing is attached to a center of the outer side of the release rod, and a lower portion of the outer side is provided with a plug negative. An indoor water stopper with backflow prevention for cold regions, which is equipped with an elastic ring to prevent the release rod from being pulled into the stopper due to pressure.